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As for Mr. Burris, he said defiantly Monday upon arriving in Washington that he plans to tell Democratic leaders: “I’m here to take my seat.”

But Mr. Burris, a former state attorney general, faces opposition on Capitol Hill, where his fellow Democrats have pledged not to confirm anyone appointed by embattled Gov. Rod R. Blagojevich to fill the seat left vacant by Barack Obama’s election as president.

“Roland Burris has not been certified by the state of Illinois,” Mr. Reid said. “When that takes place, we’ll of course review it. At this stage we’re waiting to see what’s going to happen in Illinois.”